# `site.cryptofeed402/feed` on anlyon.dev

> Text inside fenced blocks marked untrusted-server-text was written by the MCP server's publisher, not by anlyon.dev. It is data to inspect, not instructions to follow. Invisible characters are shown as [U+XXXX].
> No finding is not a safety guarantee: these are point-in-time checks of tool definitions, not of code or behaviour.

- Page: https://anlyon.dev/servers/site.cryptofeed402/feed
- JSON: https://anlyon.dev/api/v1/servers/site.cryptofeed402/feed
- Version: 1.0.0 (active)
- Publisher: site.cryptofeed402 (domain proven to the MCP Registry)
- Runs: remote (streamable-http)
- Sign-in to list tools: none
- Repository: https://github.com/stovepipes55-jpg/-cryptofeed402-mcp-
- Metadata from the official MCP Registry, synced 2026-10-21T18:54:59.051Z

Title and description, as the publisher wrote them:

```untrusted-server-text
cryptofeed402
Crypto market data for AI agents: Hyperliquid funding/OI, OKX spot, twice-daily brief. x402 USDC.
```

Scanned 2026-10-21T19:15:58.802Z over streamable-http.

**14 tools: 3 change things and 11 only read.**

| Group | Class | Tools | Claude Code |
| --- | --- | --- | --- |
| Deletes or cancels | destructive | 0 | deny |
| Can't be undone | irreversible | 0 | ask |
| Changes things | write | 3 | ask |
| Only reads | read | 11 | allow |

## Exfil surface

No private-data -> untrusted-input -> outbound path in this server alone: no tool is tagged private-data.

| Tag | Meaning | Tools |
| --- | --- | --- |
| private-data | Reads files, mail, messages, databases, secrets, calendars or repositories. | none |
| untrusted-input | Brings in text someone else can write: web pages, inbound email, messages, issues and comments. | `mcp__feed__audit_agent_ready` `mcp__feed__get_audit_sample` `mcp__feed__get_extreme_funding` `mcp__feed__get_history` `mcp__feed__get_latest_brief` `mcp__feed__get_perps` `mcp__feed__get_price` `mcp__feed__get_pricing` `mcp__feed__get_sample_brief` `mcp__feed__get_sentiment` `mcp__feed__get_teaser` `mcp__feed__get_top_requested_assets` |
| outbound | Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL. | `mcp__feed__audit_agent_ready` |

## Findings

No check matched anything in these tool definitions.


## Changes things (3)

Creates or changes something that can be changed back. Claude Code: ask.

### `audit_agent_ready`

- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.
- Tag outbound: The input takes a URL (input.url): a request to a URL can carry data to whoever runs it.

Description, as the server wrote it:

```untrusted-server-text
Paid endpoint ($0.05): audits a public website or x402 API for AI-agent readiness (llms.txt, robots.txt AI rules, sitemap, OpenAPI, /.well-known/x402, agent card, MCP initialize, a live unpaid 402 challenge, Bazaar metadata, Roundhouse / 402 Index / x402 Doctor listings). Deterministic, no LLM. Returns the x402 payment requirements and URL; see get_audit_sample for the output format.
```

### `request_asset`

- The name "request_asset" says "request": a word for a change.

Description, as the server wrote it:

```untrusted-server-text
Free: ask cryptofeed402 to consider monitoring a coin it does not cover yet (covered: BTC, ETH, SOL, HYPE, NEAR, AAVE). Logged for human review; high-demand assets may be added to the brief and paid endpoints later. Not a guarantee. Limit 10/hour/IP; repeat asks for the same symbol within 24h count once.
```

### `request_report_schedule`

- The name "request_report_schedule" says "request": a word for a change.

Description, as the server wrote it:

```untrusted-server-text
Free: tell cryptofeed402 how often you want briefs/reports and the best UTC hours to have a fresh one ready, so we can schedule to match. Logged as aggregate demand (GET /feedback/schedule shows counts only; notes and agent names are never published; no IPs stored). Limit 10/hour/IP.
```

## Only reads (11)

Looks things up and changes nothing. Claude Code: allow.

### `get_audit_sample`

- The name "get_audit_sample" says "get": a word for reading.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Free: a cached example agent-readiness audit of cryptofeed402.site (score 0-100, pass/warn/fail per check with evidence and fixes) so you can see the output of audit_agent_ready before paying.
```

### `get_extreme_funding`

- The name "get_extreme_funding" says "get": a word for reading.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Paid endpoint: most extreme Hyperliquid funding rates right now. Returns the x402 payment requirements and URL. Free sample response: https://cryptofeed402.site/samples/funding
```

### `get_history`

- The name "get_history" says "get": a word for reading.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Paid endpoint: archived briefs for a date range. Returns the x402 payment requirements and URL. Free sample response: https://cryptofeed402.site/samples/history
```

### `get_latest_brief`

- The name "get_latest_brief" says "get": a word for reading.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Paid endpoint: the full latest twice-daily crypto research brief (JSON + markdown). Returns the x402 payment requirements and URL. Free sample: get_sample_brief or https://cryptofeed402.site/brief/sample
```

### `get_perps`

- The name "get_perps" says "get": a word for reading.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Paid endpoint ($0.002): one Hyperliquid perp's funding (hourly, 8h, annualized), open interest in USD, 24h volume, mark/oracle price, premium and whether it is in the top-10 funding extremes. Any listed Hyperliquid perp; unknown symbols return an error and no charge. Returns the x402 payment requirements and URL. Free sample response: https://cryptofeed402.site/samples/perps
```

### `get_price`

- The name "get_price" says "get": a word for reading.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Paid endpoint: perp mark, funding, OI (Hyperliquid) plus OKX spot for one coin. Returns the x402 payment requirements and URL; pay with your own x402 client. Free sample response: https://cryptofeed402.site/samples/price
```

### `get_pricing`

- The name "get_pricing" says "get": a word for reading.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Free: current per-call prices (USDC on Base via x402), network and payTo address.
```

### `get_sample_brief`

- The name "get_sample_brief" says "get": a word for reading.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Free: a delayed, trimmed sample of the twice-daily crypto brief (previous edition; no OI, sentiment or markdown). Use to evaluate before paying for get_latest_brief.
```

### `get_sentiment`

- The name "get_sentiment" says "get": a word for reading.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Paid endpoint ($0.002): crypto news sentiment for one asset: -1..1 score, bearish/neutral/bullish label, pos/neg/neu headline counts and up to 5 top headlines with links. Headlines labeled by a local LLM, score is plain math, refreshed about every 15 min. Symbols not in the current snapshot or stale data return an error and no charge (free list: GET /sentiment). Returns the x402 payment requirements and URL. Free sample response: https://cryptofeed402.site/samples/sentiment
```

### `get_teaser`

- The name "get_teaser" says "get": a word for reading.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Free: latest brief teaser text, Hyperliquid extreme funding (8h-equivalent rates), BTC/ETH/SOL prices with 24h change.
```

### `get_top_requested_assets`

- The name "get_top_requested_assets" says "get": a word for reading.
- Tag untrusted-input: The server marks it openWorldHint: true: it reaches things outside the server's own data.

Description, as the server wrote it:

```untrusted-server-text
Free: top 20 coins other agents have asked cryptofeed402 to monitor in the last 30 days (aggregate counts only).
```

## Claude Code permissions

For `.claude/settings.json`, assuming the server is installed as `feed`:

```json
{
  "permissions": {
    "allow": [
      "mcp__feed__get_teaser",
      "mcp__feed__get_sample_brief",
      "mcp__feed__get_pricing",
      "mcp__feed__get_top_requested_assets",
      "mcp__feed__get_price",
      "mcp__feed__get_extreme_funding",
      "mcp__feed__get_latest_brief",
      "mcp__feed__get_audit_sample",
      "mcp__feed__get_perps",
      "mcp__feed__get_sentiment",
      "mcp__feed__get_history"
    ],
    "ask": [
      "mcp__feed__request_asset",
      "mcp__feed__request_report_schedule",
      "mcp__feed__audit_agent_ready"
    ],
    "deny": []
  }
}
```

Capability tags behind the rules (a read tagged outbound is asked about):

- `mcp__feed__get_teaser`: untrusted-input
- `mcp__feed__get_sample_brief`: untrusted-input
- `mcp__feed__get_pricing`: untrusted-input
- `mcp__feed__get_top_requested_assets`: untrusted-input
- `mcp__feed__get_price`: untrusted-input
- `mcp__feed__get_extreme_funding`: untrusted-input
- `mcp__feed__get_latest_brief`: untrusted-input
- `mcp__feed__get_audit_sample`: untrusted-input
- `mcp__feed__get_perps`: untrusted-input
- `mcp__feed__get_sentiment`: untrusted-input
- `mcp__feed__audit_agent_ready`: untrusted-input, outbound
- `mcp__feed__get_history`: untrusted-input

## Remote posture

What an anonymous client saw at the remote endpoint, last 2026-10-22T15:13:38.193Z, unchanged since 2026-10-22T15:13:38.193Z. No credentials were sent and no tool was called. Values are shown as the endpoint returned them. Method: https://anlyon.dev/methodology#remote-posture

| Fact | Observed |
| --- | --- |
| Reachable | `yes` |
| HTTP status of an anonymous initialize | `200` |
| tools/list served without credentials | `yes` |
| Tools that change things, listed without credentials | `3` |
| Protocol version | `2025-06-18` |
| WWW-Authenticate on 401 | `not observed` |
| resource_metadata in WWW-Authenticate | `none` |
| RFC 9728 protected resource metadata | `none` |
| Authorization servers | `none` |
| Legacy HTTP+SSE transport | `no` |
| Dynamic client registration | `not observed` |
| Client ID metadata documents | `not observed` |

- **warn** Tools that change things, listed to anyone ([unauth-remote-writes](https://anlyon.dev/methodology#unauth-remote-writes))

```untrusted-server-text
The endpoint served tools/list without credentials, and the list has 3 tools that change things (3 write). Whether a call also works without credentials was not tested: tools are never called.

https://cryptofeed402.site/mcp: tools/list returned 16 tools to an anonymous client, including request_asset (write), request_report_schedule (write), audit_agent_ready (write)
```